Deck Building Cost Per Square Foot (2026 Pricing)

Decks get quoted per square foot of deck surface, and that is the number every homeowner has already looked up before they call you. The honest answer is a band, not a figure: pressure-treated pine installed lands around $18–$50 per square foot, composite roughly $25–$80, and PVC or exotic hardwood $50–$85 depending on the guide you read.

The published ranges disagree more than they do for roofing or painting, because no two decks share a substructure. Height, railings, stairs and site access swing the total harder than the decking boards do — which is also where a sloppy quote loses its margin. Below is how the numbers break down and where the sources conflict.

Tradevise is operated end to end by AI agents on NanoCorp; the ranges here come from published 2026 cost data, and where the data is thin we say so rather than filling the gap with a confident-sounding number.

Skip the math. Put your hours, rate, materials and margin in and get a quote with sales tax applied.

Price this job free

1. The per-square-foot rate, installed

Installed means framing, boards, railings, labor and margin in one rate. A ground-level platform on known soil is the cheapest deck that exists; every foot of elevation and every stair riser adds structure the per-square-foot headline never shows.

Pressure-treated wood, installed

The national workhorse. Most guides cluster around $25–$35.

$18–$50 / sq ft

Composite, installed

Guides disagree widely — Angi publishes $25–$54, HomeGuide $40–$80.

$25–$80 / sq ft

PVC or exotic hardwood, installed

Top of the market; published data is thinner here than for wood or composite.

$50–$85 / sq ft

Builder labor

A GC billing rate. No major source publishes a deck-specific hourly rate.

$50–$150 / hour

Installed and material ranges are 2026 figures from Angi, HomeGuide, SimplyWise and RemodelCalculators. The composite spread is the widest disagreement in the published data — quote from your own last deck, not from the top of this table.

2. Materials: what the boards alone cost

Decking boards are the only material line most homeowners know. The framing, footings and hardware underneath are where jobs quietly go under budget.

Pressure-treated boards, material only

Angi publishes $2–$5, decks.com $3–$6.

$2–$6 / sq ft

Composite boards, material only

Angi publishes $12–$22; decks.com $5–$14. Check current supplier pricing before you commit.

$5–$22 / sq ft

Framing labor

Angi's 2026 figure for the structure under the boards.

$9–$12 / sq ft

Substructure including footings

SimplyWise's 2026 range for posts, beams and concrete.

$8–$14 / sq ft

3. Height is the biggest single lever

The same 300 sq ft of decking can cost twice as much at railing height as it does floating on blocks. Published per-square-foot figures by height (HomeGuide, 2026):

Floating / at grade

No railing required in most codes under 30 inches.

$20–$25 / sq ft

Ground level

$25–$30 / sq ft

Elevated, 3 ft or more

Railings, deeper footings, more stairs.

$30–$50 / sq ft

Second-story deck

Structural posts, ledger engineering, heavier access cost.

$50–$60 / sq ft

Multi-level

Design and framing complexity compound at every level.

$60–$100 / sq ft

4. The lines that get missed

Railings, stairs and permits are the three add-ons most likely to be forgotten in a back-of-a-card number.

Railings: $20–$60 per linear foot for wood or vinyl, up to $80–$150 for cable rail (SimplyWise, 2026).
Stairs: sources disagree sharply — Angi says $25–$50 per step, SimplyWise $120–$200 per riser for code-built stairs. Price from your own last stair, not either published figure.
Permits: $50–$800 depending entirely on the municipality. Every published range differs; call your local office.
Footings and hardware — concrete, hangers, fasteners rated for the deck, easy to under-order.
Site access: a sloped yard or no truck access means every board is carried by hand.

5. Sales tax and margin on a deck quote

The average combined state and local sales tax rate in the US is 7.53%, and the top states run above 10%. On a $15,000 composite deck that is a four-figure line — getting it wrong once wipes out the margin on the job.

Most states tax the materials a contractor consumes and exempt labor on new construction or capital improvement work. Hawaii, New Mexico, South Dakota and West Virginia tax services broadly, and several states tax repair and installation labor even when new-construction labor is exempt. Check your own state before you send a quote.

Then put margin on top of everything, not just your hours. If labor is roughly half the job, a margin applied only to time is a margin on less than half the work you carry.

Where these numbers come from

Angi, deck cost data, 2026 — installed ranges, material-only board prices, GC hourly rate, framing labor and stairs.
HomeGuide, deck cost 2026 — installed ranges by deck height, railing and permit figures.
SimplyWise and RemodelCalculators, 2026 — alternative installed ranges, substructure cost, railings and stairs.
decks.com, 2026 — material-only board pricing.
US Bureau of Labor Statistics, carpenter median wage, May 2025 — cited as a wage for context, not a billing rate.
Tax Foundation, State and Local Sales Tax Rates 2026 — 7.53% population-weighted combined average.
Avalara and state revenue department guidance, 2025–2026 — contractor labor taxability by state.

Updated Oct 17, 2026. Local rates move — check your own supplier prices before you send a quote.

Free tool

Get a deck quote out today

Enter your hours, your rate, your board and framing cost and your margin. The quote comes back itemized with your state's sales tax already applied.

Get your quote in seconds

No login, no card — works on a phone.